The catless downpipe helps mitigate the downside of having an exhaust method put up-turbo whilst significant-movement cats provide enough processing for this further gaseous emissions. #two- They can be costlier: Compared with catless downpipes, catted ones is usually dearer. They come with Platinum and Palladium that boost the cost appreciably. https://downpipe43108.scrappingwiki.com/787610/what_does_downpipes_mean